Akademik Veri Yönetim Sistemi
Journal of Magnetism and Magnetic Materials, cilt.652, 2026 (SCI-Expanded, Scopus)
We present a comprehensive investigation of the static magnetic response of a mixed spin-1/2 and spin-1 ferrimagnetic Ising model in the presence of a bimodal fluctuating crystal field within mean field theory. Temperature- and anisotropy-driven scans reveal the presence of re-entrant ferrimagnetic ordering, first-order transitions, tricritical and isolated critical points induced by crystal field fluctuations. The fluctuation parameter α is demonstrated to play a decisive role in shaping re-entrant structures and modifying the stability of ferrimagnetic phases. The analysis focuses on the staggered susceptibility χs and the total susceptibility χt, which play distinct roles in characterizing the magnetic properties of the system. We show that χs, associated with the principal ferrimagnetic order parameter, diverges at second-order transitions and tricritical points. The critical and multicritical behavior of χt is characterized by a discontinuity. Both χs and χt display finite jumps near first-order transition points. By scanning various values of the fluctuation parameter α, we extensively investigate how the disorder influences the thermal behavior of both magnetic response functions. Finally, the crystal field dependence of isothermal total and staggered susceptibilities is presented in detail. The results provide a qualitative mean field description of how crystal-field fluctuations can induce anomalous magnetic responses and re–entrant ferrimagnetic behavior in mixed spin systems.